Is this a 4 byte or 7 byte UID? Can the UID be changed?

Uid cannot be changed. They are not clone cards. 4 byte uid

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NFC DESFire EV3 2K/4K/8K RFID Blank White Cards Work with All NFC Functional Phone -1PCS (EV3 2K)

Product ID: 385448106

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🎨Printable with Evolis printer for custom designs

💳Credit card size for sleek portability

📶13.56 MHz NFC frequency

Description

💳 Unlock the future of secure access with style and ease!

CUSTOMIZABLE CANVAS - Blank white surface ready for high-quality printing with Evolis printers—perfect for branding.
COMPACT CONVENIENT - Credit card dimensions make it easy to carry and integrate into everyday workflows.
VERSATILE MEMORY OPTIONS - Choose from 2K, 4K, or 8K memory sizes to fit your security and data needs.
SEAMLESS NFC COMPATIBILITY - Works flawlessly with all NFC-enabled smartphones for instant connectivity.
PROFESSIONAL GRADE DURABILITY - Crafted from sturdy PVC material ensuring long-lasting use in any environment.

The NFC DESFire EV3 card operates at 13.56 MHz and comes in 2K, 4K, or 8K memory sizes, offering flexible data storage options. Sized like a credit card and made from durable PVC, it supports high-quality printing via Evolis printers for personalized branding. Compatible with all NFC-enabled phones, it’s a sleek, professional solution for secure access and identification.

Specifications

ASIN	B0915SGV2N
Best Sellers Rank	#381,717 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #233 in Commercial Access Cards
Brand Name	YARONGTECH
Customer Reviews	4.0 4.0 out of 5 stars (15)
Date First Available	April 5, 2016
Is Discontinued By Manufacturer	No
Item Weight	0.176 ounces
Item model number	DESFIRE EV1
Model number	DESFIRE EV1
Package Dimensions	3.5 x 2.3 x 0.16 inches

Reviews

R**.

As advertised

Worked as expected

26.08.2023

K**B

High quality RFID cards.

27.11.2025

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